Transmission system.



A. WRAY.

TRANSMISSION SYSTEM.

APPLICATION, men 001.2. 1915. RENEWED SEPT. 12. 1911.

ml non-u nun m, rnmunm. muumcm mac.

A. WRAY.

TRANSMISSION SYSTEM. APPLICATION FILED 0on2. 1915. RENEWED SEPT. 12. 1911.

Patented Jan. 21, 1919.

2 SHEETS-SHEET 2 In: loin: mm ea. rnmuymx. \nsmnmn. A c

UNITED STATES PATENT orrron.

ARCI-IIBALD WRAY, OF PARK RIDGE, ILLINOIS ASSIGNOR T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. -Y., A CORPORATION OF NEW YORK.

TRANSMISSION SYSTEM.

Application filed October 2, 1915, Serial No. 53,683.

To all whom it may concern:

Be it known that I, ARCHIBALD WRAY, citizen of the United States, residing at Park Ridge, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Transmission Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specificanect despatchers ofiices with various stations, and in carrying out the invention, when thus embodied, I place a condenser of suitable capacity in normally open bridge of the associate transmission line and provide means for charging the condenser when in such open circuit. When a substation upon the line is to be signaled from the main or despatchers office, the normally open bridge is closed to permit the condenser to discharge upon the line and operate apparatus at the wanted station to attract the attention of the operator located there. The means for thus governing the association of the condenser is desirably in the form of relay mechanism which is operated by the despatcher to cut out the charging generator and connect-the condenser with the line. The apparatus at the substations responsive to the discharge of the condenser is desirably in bridge of the transmission line. the various bridges including adjusting resistance to make the pressure of the condenser current applied thereto substantially uniform, .so that such current will be evenly divided among the bridges.

I will explain my invention by reference to the accompanying drawings in which Figures 1 and 2 taken collectively show the preferred embodiment thereof as embodied in a train despatching system.

The despatchers or transmitting station is indicated at A, the despatching equip- Specification of Letters Patent. Patented Jan, 21, 1919 Renewed September 12, 1917. Serial No. 191,062.

ment including a local circuit containing condenser controlling line relays 1, 2, a local battery 3, and the normally open armature switch 4 of a relay 5. A dial 6 is provided with a local contact 7 connected with the normally disengaged contact of an armature switch 8 of relay 5. Said dial also has contacts 9, 10, etc, individual to the substations or receiving stations of which two (B and C) are shown. The d1al also has a restoring contact 11, and a spring motor driven clockwise moving wiper or arm 12 that sweeps over the dial contacts and rests normally in engagement with contact 7. Substation selecting keys 13 and 1 1 are respectively individual C, and their dial contacts 9, 10, as are also the switches 15, 16, controlled by said keys. The keys have detents 17, 18, that are respectively individual to theckeys and keep to the substations B and them in depressed positions until the releas key closes circuit through the starting magnet 22 that withdraws the detent 23 from engagement with the catch 24 upon the spring operated shaft 25 which carries the Wiper 12. When this detent and catch are disengaged, the spring 25 turns 12 until it engages the restoring contact 11, and instantly thereafter comes into resting engagement with the normal contact 7 as a consequence of the reengagement of the detent and catch. When the contact (9 or 10, etc.) which .is individual to the depressed key (13 or 14. etc), the wanted substation is signaled. The armature switches of line relays 1 and 2 are connected through the windings 26 of a retardation coil, and a condenser 27 con nected between the retardation coil windings. The normal contacts of these armature the wiper the wiper engages switches may be connected with any suitable source of charging current, such asza power alternate contacts of the armature switches such that of relays 1 and 2 are connected with the different sides and 31 of the transmission line. When these armature switches are attracted, the condenser charging circuit is opened and the condenser is connected across the line.

At each substation there is a switch comprising a revoluble contact 32 and a stationary spring contact 33. The contact 32 is mounted upon a shaft 34 driven by a spring This shaft carries a stop 36 engaged by a detent 37. When a starting magnet 38 is energized, the detent is withdrawn to permit the shaft to turn one revolution when the stop and detent again engage, this portion of the equipment being similar to similarly illustrated equipment at the main or despatchers ofiice. The contacts 32 and 33 are differing distances apart at the substations, corresponding to the positions of the waiting contacts 9 10, etc. The arrangement is when the wiper 12 engages the first substat on contact 9, the contacts 32, 33,

V at one station only are in engagement; when the wiper 12 engages the next substation contact 10, the contacts 32, 33, at another substation only, are in engagement, etc. A

line or starting control relay 39 is provided in bridge of the transmission line at each substation, each of the relays 39 on the line e ng ene ed i e n h el g n oration consequent upon two energizations or relays 1 and 2. The first energization of relays '39 energizes all starting magnets 38 by including them in local circuits with the armature switches of relays 39 and the bater es 45 Suc fi st ene e zati f ay 39 is effected upon the closure of the starting switch 21 at the despatchers ofiice, that clc'ses circuit through relay 5 that in turn closes eircuit throngh-the line relays 1 and 2 at the ermature switch 1, whereby the condenser included in bridge of the line to effect the first operation of all relays 39. Th c rcu t thus s bl e th r a 5 i d es he cantat 7 a d the Wiper 12 rea ly n a in itas th p s m d a el te ped 'f rem som 7 Owing to h establishment of the circuit for the starting ma net 22 thr ug the b ery 3, Starting key 21, contact 7 and wiper 12, the circuit thr u h t "li e r s l and 2 is bFo-ken e 't firet e cr izat n O r lay 3 The second energization of relays 39 occurs h th 11 relays nd 2 a e h mselves "energized second time, a resultwhich occurs when the wiper 12 closes circuit through the contact (9 or 10, etc.) connected wi h he sl leyed li M 3 r 1 a) nd i i al to h Wanted Sub tation, h tabl hed si e it incli i he W nth s leqtesi c nt st 9 0r 0, he m le e i h .6.0 16, th la s and'% ba 3 an the the interval between the two energizations of relays 1 and 2, the armature switches of these relays remain in connection with their normal contacts to permit the generator 28 again to, charge the condenser 27, so that when the relays 1 and 2 are again energized, the condenser will be connected in discharging relation with the line for the second time, and when the contacts 32 and 33 at the wanted substation are in engagement, the contacts 32 and 33 at all other stations being then out of engagement. As a result of the.second discharge of the condenser, all relays 39 are energized for the second time, but only the relay 39 at the wanted station functions, this particular relay closing its armature switch when the contacts 32 and 33 at the wanted station are closed, with the result that relay 41 (at the selected station only) is included in its energizing circuit that contains the battery 40, the armature switch of relay 39 at the selected station, and the engaged contacts 32 and 33 at this station. The armature switch of the energized relay 4C1 establishes a local circuit through the signal bell or responsive device 4'3 and battery 4L0 at the selected station, this armature switch also establishing a locking circuit for this relay that includes battery 40, winding of relay ll, the circuit breaking ke 4 1 and the armature switch of relay 41. WVhen the operator at the signaled substation responds, he operates key l4: to open the locking circuit of relay 41 to complete the restoration of the signaling equipment to normal, the contact 32 (in company with the contacts 32 at unselected stations) being restored to normal independently as the magnets 38 are deenergi-zed immediately after their energization, owing to the retraction of the armature switches of relays 39, whereby the detents 37 are at liberty to engage their stops 36 when the shafts 3% have each completed a revolution. The bridges having the relays 39 desirably have impedance coils 4L5, 46,'one upon each side of a relay 39. These bridges may also include adjusting resistances 47 for the purpose of equalizing the pressure upon the bridges of the current discharged from the condenser 27 v The transmissionline 30-, 31, is shown in the form of a telephone line, tliere being at the despatchers oflice and each of the substations a local circuit including a telephone transmitter 48, a talking battery 49 and a primary coil 50. There is also at each station a telephone receiver 51 in bridge, or adapted to be included in bridge, or the main line 30, 31, and in series with a secondary 52 and local condenser 53. At the main otfice the associations of the telephone receiver and transmitter are governed by a spring jack 5%, and at each substation by a telephone switch hook 55.

Telegraphic equipment may also be associated with the line. I have illustrated simplex instruments 56 in ounded branches ofmain line bridges that include retardation coils 57. The substations may be provided with hand generators 58 for operating the call bell 59 at the despatchers office.

The set of batteries which the condenser 27 replaces is duplicated and usually requires annual or semi-annual renewal. The condenser is about of the cost of one set of batteries and does not require renewal. The generator for charging the condenser does not need to be connected in circuit long, and as the current may usually be secured from some lighting circuit, no investment in a generator is required, while the charge from the lighting company for current consumed is small.

While I have herein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited thereto, "but having thus described my invention, I claim as new and desire to secure by Letters Patent the following 1. A transmission system including a transmission line extendin from a transmitting station to a pluraIity of receiving stations; responsive devices at the receiving stations; one set of instrumentalities distrib uted among the receiving stations and performing their functions in succession and having partial control of said responsive devices; a second set of instrumentalities connected with the line and distributed among the receiving stations and in starting relation to and cooperating with the aforesaid instrumentalities in controlling said responsive devices controlling relay mechanism at the transmitting station end of the transmission line; a condenser; acondenser charging source of current; switching mechanism controlled by the controlling relay mechanism and permitted by the controlling relay mechanism when idle to include the condenser in circuit with said charging source of current, and operated by the controlling relay mechanism, when employed, to exclude the condenser from such circuit and include it in circuit with the line; switching mechanism at the transmitting station for operatin the controlling relay mechanism to connect the condenser with the line for operating the instrumentalities of the second set to start the instrumentalities of the first set; and a receiving station selecting switching mechanism at the transmitting station for oper ating the controlling relay mechanism a second time to connect the condenser with the line a second time again to operate the instrumentalities of the second set to enable the one thereof at the selected station to cooperate with the companion instrumentality in operating the-associate responsive device.

2. A transmission system including a transmission line extending from a transmitting station to a plurality of receiving stations; responsive devices at the receiving stations; one set of instrumentalities distributed among the receiving stations and performing their functions in succession and having partial control of said responsive devices; a second set of instrumentalities connected with the line and distributed among the receiving'stations and in starting relation to and cooperating with the aforesaid instrumentalities in controlling said responsive devices; controlling relay mechanism at the transmitting station end of the trans mission line; a condenser; a condenser charg ing source of current; switching mechanism controlled by the controlling relay mechanism to include the condenser in circuit with the charging source of current; switching mechanism at the transmitting station for operating the controlling relay mechanism to connect the condenser with the line for operating the instrumentalities of the second set to start the instrumentalities of the first set; and a receiving station selecting switching mechanism at the transmitting station for operating the controlling relay mechanism a second time to connect the condenser with the line a second time again to operate the instrumentalities of the second set to enable the one thereof at the selected station to cooperate with the companion instrumentality in operating the associate responsive device.

3. A transmission system including a transmission line extending from a trans mitting station to a plurality of receiving stations; responsive devices at the receiving stations; one set of instrumentalities distributed among the receiving stations and performing their functions in succession and having partial control of said responsive devices; a second set of instrumentalities connected with the line and distributed among the receiving stations and in starting relation to and cooperating with the aforesaid instrumentalities in controlling said responsive devices; controlling mechanism at the transmitting station end of the transmission line; a condenser; a condenser charging source of current; switching mechanism controlled by the con trolling mechanism and permitted by the controlling mechanism when idle to include the condenser in circuit with said charging source of current, and operated by the controlling mechanism, when employed, to exclude the condenser from such circuit and include it in circuit with the line; switching mechanism at the transmitting station for operating the controlling mechanism to connect the condenser with the line for operating the instrumentalities of the sec ond set to start the instrumentalities of the first set; and a receiving station selecting switching mechanism at the transmitting station for operating the controlling mecha- &

nism a second time-to connect the condenser with the line a second time again tooperate the instrumentalities of the second set to enable the one thereof at the selected station to cooperate With the companion instrumentality in operating the associate rethe aforesaid instrumentalities in controlling said responsive devices; controlling mechanism at the transmitting station end of the transmission line; a condenser ;1 a condenser charging source of current; switching mechanism controlled by the Copies ct this patent may be obtained for five cents each, by addressing the Waehington, D, Q.

controlling mechanism to include the condenser in. circuit with the chargingsource of current; mechanism at the transmitting station for operating the controlling mechanism to connect the condenser With the line for operating the instrumentalities of] the second set to start the instrumentalities of the first set; anda receiving station select: ing switching mechanism at; the transmitting station for operating the controlling mechanism, a second, time to connect the condenser with. the line a. second, timeagain to. operate the ,instrumentalities of the second set to enable the one thereof at the selected station to cooperate With the companion instrumentality in (;)perati ng the associate responsive device. v

In Witness whereof, I hereunto subscribe my'namethis 20th day of September, A.-D. 1915'.

Witnesses G. Grace, M. S. Rosnn'zwnrc.

A'RGHI'BALD WRfAY, g, 

